The activities of Cu/Mn/Mg/K catalyst with different supporter have been investigated in methanol decomposition reaction as function of copper support interaction, dispersion and valency structure of copper and pore s...The activities of Cu/Mn/Mg/K catalyst with different supporter have been investigated in methanol decomposition reaction as function of copper support interaction, dispersion and valency structure of copper and pore structure of catalysts. XRD, TPR, XPS and BET methods are used to characterize the structure of catalysts and interaction between CuO/Cu and support. The results indicated that the Cu/Mn/Mg/K catalyst is much better than conventional Cu/Zn/Al catalyst in methanol decomposition, the supporters behave differently, and the catalyst supported on Al 2O 3 gives the best result.展开更多
In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was designed.The effect of Si alloying on the sur...In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was designed.The effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was studied.The results showed that introducing Si into the Al−Mn−Mg−Er−Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the alloy.The maximum relative density of the SLM-fabricated Si/Al−Mn−Mg−Er−Zr alloy reached 99.6%.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,respectively.These values were higher than those of the SLM-fabricated Al−Mn−Mg−Er−Zr and other Sc-free Al−Mg-based alloys.展开更多
文摘The activities of Cu/Mn/Mg/K catalyst with different supporter have been investigated in methanol decomposition reaction as function of copper support interaction, dispersion and valency structure of copper and pore structure of catalysts. XRD, TPR, XPS and BET methods are used to characterize the structure of catalysts and interaction between CuO/Cu and support. The results indicated that the Cu/Mn/Mg/K catalyst is much better than conventional Cu/Zn/Al catalyst in methanol decomposition, the supporters behave differently, and the catalyst supported on Al 2O 3 gives the best result.
基金National Natural Science Foundation of China(Nos.52001140,52274363)Guangdong Basic Applied Basic Research Foundation,China(Nos.2022A1515010558,2022A1515011597,2022A1515240065)。
基金the National Natural Science Foundation of China(Nos.51801079,52001140)the Portugal National Funds through FCT Project(No.2021.04115).
文摘In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was designed.The effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was studied.The results showed that introducing Si into the Al−Mn−Mg−Er−Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the alloy.The maximum relative density of the SLM-fabricated Si/Al−Mn−Mg−Er−Zr alloy reached 99.6%.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,respectively.These values were higher than those of the SLM-fabricated Al−Mn−Mg−Er−Zr and other Sc-free Al−Mg-based alloys.
基金financially supported by the National Natural Science Foundation of China(No.52071276)the Natural Science Foundation of Chongqing City,China(No.cstc2020jcyj-msxm X0933)。
基金the financial support from the National Key Research and Development Program of China(No.2022YFE0109600,2021YFB3701100)the National Natural Science Foundation of China(No.52071344,52150710544)。
基金The present work is financially supported by the National Key Research and Development Program of China(No.2020YFB0311203)the Natural Science Foundation of Henan,China(No.202300410005).
